chore: add issue template

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report（报告问题）
+about: Create a report to help us improve
+---
+<!--
+    注意：为更好的解决你的问题，请参考模板提供完整信息，准确描述问题，信息不全的 issue 将被关闭。
+    Note: In order to better solve your problem, please refer to the template to provide complete information, accurately describe the problem, and the incomplete information issue will be closed.
+-->
+## Bug report（问题描述）
+
+#### Steps to reproduce（问题复现步骤）
+<!--
+1. [xxx]
+2. [xxx]
+3. [xxxx]
+-->
+
+#### Screenshot or Gif（截图或动态图）
+
+
+#### Link to minimal reproduction （最小可在线还原demo）
+
+<!--
+Please only use Codepen, JSFiddle, CodeSandbox or a github repo
+-->
+
+#### Other relevant information（格外信息）
+- Your OS:
+- Node.js version:
+- vue-element-admin version:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request（新功能建议）
+about: Suggest an idea for this project
+---
+
+## Feature request（新功能建议）
+

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question（提问）
+about: Asking questions about use
+---
+
+## Question（提问）
+
+<!--
+    提问之前，请确定你已经过自己的努力，尝试解决过这个问题。
+    若是代码相关问题，请不要只截图，请提供在线 demo，以便节约彼此的时间。
+
+    Before asking a question, please make sure that you have tried your best to solve this problem.
+    If it's a code-related issue, please don't just take screenshots. Please provide an online demo to save each other's time.
+-->